Thanks for the fantastic, well-explained replies. I understand the answers to my questions now. There are very small, potentially un-noticeable phraseology's in which you must be careful of when speaking on the radio, however of course, you can't legally act as an A/G Operator, or even speak on the radio base unless you have your radio license and have completed the "course".
But there's things such as an A/G Radio Operator using the words At your discretion. Although the pilot won't fuss about you saying that on A/G, but it's not the correct phraseology and you couldn't get in trouble for it...
Once again, thanks, my questions are now cleared up.
Regards,
Smooth Cruiser